do not depend on deprecated nose

Author: pgajdos

.gitignore

@@ -39,7 +39,6 @@ htmlcov/
 .coverage
 .coverage.*
 .cache
-nosetests.xml
 coverage.xml
 *,cover
 

.travis.yml

@@ -9,6 +9,6 @@ install:
     - pip install -U --upgrade-strategy eager ".[test]" coveralls
     - pip freeze
 script:
-    - nosetests --with-coverage --cover-package traittypes traittypes
+    - pytest --cov=traittypes traittypes
 after_success:
     - coveralls

traittypes/tests/test_import_errors.py

@@ -1,10 +1,11 @@
 
-import nose.tools as nt
+from unittest import TestCase
 
 from ..traittypes import _DelayedImportError
 
 
-@nt.raises(RuntimeError)
-def test_delayed_access_raises():
-    dummy = _DelayedImportError('mypackage')
-    dummy.asarray([1, 2, 3])
+class TestError(TestCase):
+    def test_delayed_access_raises(self):
+        dummy = _DelayedImportError('mypackage')
+        with self.assertRaises(RuntimeError):
+            dummy.asarray([1, 2, 3])